mirror of https://github.com/qpdf/qpdf.git
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/*
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* This is an example program to demonstrate use of object handle
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* functions in the C API.
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*/
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#include <qpdf/qpdf-c.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static char const* whoami = 0;
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static void usage()
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{
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fprintf(stderr, "Usage: %s infile infile-password outfile\n", whoami);
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exit(2);
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}
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QPDF_BOOL
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modify_file(qpdf_data qpdf)
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{
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/* This small example performs the following operation on the
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* document catalog (a.k.a. root):
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* - Remove PageLayout
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* - Remove OpenAction
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* - If there are outlines, set PageMode to UseOutlines; otherwise,
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* remove it.
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*/
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qpdf_oh root = qpdf_get_root(qpdf);
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qpdf_oh_remove_key(qpdf, root, "/PageLayout");
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qpdf_oh_remove_key(qpdf, root, "/OpenAction");
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/* 0 is never a valid qpdf_oh */
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qpdf_oh pagemode = 0;
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if (qpdf_oh_is_dictionary(
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qpdf, qpdf_oh_get_key(qpdf, root, "/PageLabels")))
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{
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pagemode = qpdf_oh_new_name(qpdf, "/UseOutlines");
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}
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else
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{
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pagemode = qpdf_oh_new_null(qpdf);
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}
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qpdf_oh_replace_or_remove_key(qpdf, root, "/PageMode", pagemode);
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return QPDF_TRUE;
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}
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int main(int argc, char* argv[])
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{
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char* infile = NULL;
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char* password = NULL;
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char* outfile = NULL;
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qpdf_data qpdf = qpdf_init();
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int warnings = 0;
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int errors = 0;
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char* p = 0;
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if ((p = strrchr(argv[0], '/')) != NULL)
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{
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whoami = p + 1;
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}
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else if ((p = strrchr(argv[0], '\\')) != NULL)
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{
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whoami = p + 1;
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}
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else
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{
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whoami = argv[0];
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}
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if (argc != 4)
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{
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usage();
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}
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infile = argv[1];
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password = argv[2];
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outfile = argv[3];
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if (((qpdf_read(qpdf, infile, password) & QPDF_ERRORS) == 0) &&
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modify_file(qpdf) &&
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((qpdf_init_write(qpdf, outfile) & QPDF_ERRORS) == 0))
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{
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/* Use static ID for testing only. For production, a
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* non-static ID is used. See also
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* qpdf_set_deterministic_ID. */
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qpdf_set_static_ID(qpdf, QPDF_TRUE); /* for testing only */
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qpdf_write(qpdf);
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}
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while (qpdf_more_warnings(qpdf))
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{
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warnings = 1;
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printf("warning: %s\n",
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qpdf_get_error_full_text(qpdf, qpdf_next_warning(qpdf)));
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}
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if (qpdf_has_error(qpdf))
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{
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errors = 1;
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printf("error: %s\n",
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qpdf_get_error_full_text(qpdf, qpdf_get_error(qpdf)));
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}
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qpdf_cleanup(&qpdf);
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if (errors)
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{
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return 2;
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}
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else if (warnings)
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{
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return 3;
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}
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return 0;
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}
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